Stop mechanism



1934- A. P. BEREJKOFF ET AL- 1,977,334

STOP MECHANISM Filed Jan. 18, 1934 lllll 'lllllt mum-lam Inventors: Anatole F? Berejkoffi Fromcis C. Err'oc mom,

Then" Attovneg.

Patented Oct. 16, 1934 Anatole P. Bereg koff and Francis C. Brockman,

Schenectady, N.'Y., assignors to General Electrio Company, a corporation of New York Application January 18, 1934, Serial No. 707,231

Claims. (c1.192-139) The present invention relates to stop mechavided on the shaft 18 and meshes with a worm nisms for automatically stopping a' rotary device, gear 21 fastened to the driven shaft 13. The more particularly to the kind of mechanisms used driven shaft 13 carries in front of the panel a dial for limiting the angle of rotation of a rotary ele- 22 concentrically arranged with a segment 23 havment driven by a crank or similar driving means ing a hairline 24 for indicating the position of the at reduced speed through a reducing gearing or dial. The shaft 13 together with the dial form a the like. Arrangements of this type may be used part of a device driven by the crank. in wireless telegraphy in connection with sending The arrangement may be such that the crank and receiving apparatus, or in connection with has to be turned fifty times for one complete rotavariometers, variable capacitors or rotating intion of the dial. To permit accurate reading, 65 ductors with sliding contact and the like. another indicating disk or dial 25 is fastened to In arrangements of this a u e th dr ven dethe shaft 18. The disk 25 has a circumferential vice may be provided with a dial, indicating the portion projecting through an opening 26 in the an le f r ati n whi h is usually l s than a panel. The disk is provided with a scale and the complete rotation. The crank or knob is rotated correct reading of the position is facilitated by a 70 several times for a fraction of a complete rota hairline 27 on the panel 10. The arrangement tion of the driven device or dial. As the driven so far described is generally known in the art device in many cases includes sensitive elements, and is illustrative of various devices to which our such as capacitors or coils on which no strains invention may be applied.

Should he pp it is desirable to p o p In accordance with our invention we provide 75 means which in certain positions of the driven improved means for limiting the angle of rotation devi dir ly l h cra r drivin m an of the dial 22. In the present instance this limhe direct leekihg 0f the Crank is p tan ited angle of rotation has been fixed at 180 anguthe Shock of pp the device is then taken lar degrees. This is accomplished by the proviir y y h vi mem r and not after sion of two rotatable cam members 23 and 29 piv- 80 su h force has n u t p d y th ati of oted at 30 and 31 respectively on the panel 10. the Speed educing mechanism. The two cam members or cams are normally held The object of our invention is to provide an imin rt in osition by spring means. In the p v d means for accurately s pp the d v present instance they are connected by a single mea i t end position positions bydireetly spring 32 wound about an end portion of the shaft st pp n th ank or v n m a s at a certain 13 for normally biasing the two cams inwardly, position of t driven meansthat is, away from the disk 14, which latter forms For consideration of what we believe to be novel part of th nk, A pin 33 is fastened to the and 0111 invention, attention iS directed to the crank, in the present instance fonning a, projeefollow description and the Claims appended tion of the handle 15. Two rotatable or movthereto in Conn o With t acc p able stops 34 and 35 are fastened to the dial and aw Which forms apart of 0111' Specification two stationary or fixed stops 36 and 3'? are fas- In the d aw 1 is a front Vi Of an tened to the panel. The spring 32 biases the cam Doretlls embodying 0111' invention; 2 ilhlS- against the fixed stops 36 and 37 respectively.

40 trates a side V w of 1 p y broken away; The arrangement is shown in Fig. 1 after the and Figs. 3 and 4 are front views on a smaller scale crank has b moved in counterclockwise dirccof the pp a Shown in 1 in different p tion into an end position of the dial in which its Biting positiohszero mark registers with the hairline 24. In this The pp u Comprises a front pa 0 a d position the cam 28 has been turned in clockwise a frame 11 for supporting a driving shaft 12 and direction by the rotating pin 34 and thereby a driven shaft 13. The driving shaft 12 projects moved into the path of the pin 33 of the crank, through the panel and carries a disk 14 with a thus preventing the crank from being rotated furhandle 15. The disk together with the handle ther in counterclockwise direction. The device represent in substance a crank. The driven shaft as shown in Fig. 1 can be turned only in clock- 13 is coupled with the driving shaft 12 by means wise direction. It will be noted that in the present of a reducing gearing including a beveled gear 16 example the direction of rotation of both the fastened to the shaft 12 and meshing with a crank and the device is the same, that is, either beveled gear 17 held on one end of a shaft clockwise or counter-clockwise, due to their con- 18. The shaft 18 is supported by a bracket nection by the reducing gearing. 55 19 fastened to the frame 11. A worm 20 is pro- Fig. 3 shows the arrangement of Fig. 1 after 1.10

the crank has been turned several times in clockwise direction. The rotatable pin 34 has been moved away from the cam 28, permitting the spring to move the cam inwardly, that is, out of the path of the crank or driving means. Both cams 28 and 29 in this operating condition assume a symmetrical position, each of: them being biased towards one of the stationary stops 36 and 37. v

Fig. 4 shows the arrangement with the crank turned further in clockwise direction until the other end position has been reached in which the cam 29 has been forced into the path of pin 33 on the crank by the rotating pin 35 on the dial,

rotating pin 35 on the dial stopping further clockwise rotation. T

With our invention we have accomplished an improved stopping means whereby adriving member, such as a crank or knob, is automatically stopped when a driven member, such as a dial or other part of a device, has moved into a predetermined end position. This is effected according to our invention by the. provision of means such as cams or latches which are actuated by an element of the driven device and moved into the path of the driving member or a part thereof. The feature according to which the stopping is initiated by the driven device is important because it insures an accurate movement of the driven device into its end position; and the direct stopping of the driving element is important in that it prevents forces applied to the crank being multiplied by the speed reducing-device and applied to sensitive elements of the driven device. The arrangement which has been described in the present instance limits rotation in both directions. The limits of rotation may be changed by changing the positions of thestationary or the rotary stops or the use of diiferent cams.

What we claim as new and desire to secure Letters Patent in the United States is:

'1'. The combination of rotatable driving means, rotatable driven means, speed reducing means between them, and stop means for fixing the angle of rotation of the driven means, the stop means comprising a member actuated by the driven means to lock the driving means.

2. The combination of a rotatable driving member, a speed reducer driven by the member, a rotatable device driven from the reducer at reduced speed as regards the speed of said mem ber, and stop means for limiting the angle of rotation of the device in a certain direction, said stop means comprising a cam and a movable member on the device for moving the cam into a position 'to prevent operation of the driving member.

' 3. The combination of a crank having a pin, a device, a reducing gear between the crank and the device for driving the device at reduced speed, and means for limiting the angle of rotation of the device comprising a rotatable cam member, means biasing the cam member away from the crank, a pin fastened to the device for forcing the cam member in a certain position of the device towards the crank to prevent further rotation of the crank.

4. The combination with a device, a crank and speed reducing means for driving the device in either direction at reduced speed, and means for limiting the angle of rotation of the device comprising two rotatable cams, a pin on the crank, spring means normally biasing the cams away from the pin, and a movable pin on the device for moving in a certain position of the device one of the cams into the path of the crank pin.

5. The combination with a device, a crank and speed reducing means for driving the device in either direction at reduced speed, and means for limiting the angle of rotation of the device comprising two earns, a pin on the crank, a spring held on the device for biasing the cams toward the device, two stationary pins, and two rotatable pins on the device.

a ANATOLE P. BEREJKOFF.

FRANCIS C. BROCKMAN. 

